Developer Reference

  • 2020
  • 07/15/2020
  • Public Content
Contents

DotProd

Computes the dot product of two vectors.

Syntax

IppStatus ippsDotProd_32f(const Ipp32f*
pSrc1
, const Ipp32f*
pSrc2
, int
len
, Ipp32f*
pDp
);
IppStatus ippsDotProd_32fc(const Ipp32fc*
pSrc1
, const Ipp32fc*
pSrc2
, int
len
, Ipp32fc*
pDp
);
IppStatus ippsDotProd_32f32fc(const Ipp32f*
pSrc1
, const Ipp32fc*
pSrc2
, int
len
, Ipp32fc*
pDp
);
IppStatus ippsDotProd_32f64f(const Ipp32f*
pSrc1
, const Ipp32f*
pSrc2
, int
len
, Ipp64f*
pDp
);
IppStatus ippsDotProd_32fc64fc(const Ipp32fc*
pSrc1
, const Ipp32fc*
pSrc2
, int
len
, Ipp64fc*
pDp
);
IppStatus ippsDotProd_32f32fc64fc(const Ipp32f*
pSrc1
, const Ipp32fc*
pSrc2
, int
len
, Ipp64fc*
pDp
);
IppStatus ippsDotProd_64f(const Ipp64f*
pSrc1
, const Ipp64f*
pSrc2
, int
len
, Ipp64f*
pDp
);
IppStatus ippsDotProd_64fc(const Ipp64fc*
pSrc1
, const Ipp64fc*
pSrc2
, int
len
, Ipp64fc*
pDp
);
IppStatus ippsDotProd_64f64fc(const Ipp64f*
pSrc1
, const Ipp64fc*
pSrc2
, int
len
, Ipp64fc*
pDp
);
IppStatus ippsDotProd_16s64s(const Ipp16s*
pSrc1
, const Ipp16s*
pSrc2
, int
len
, Ipp64s*
pDp
);
IppStatus ippsDotProd_16sc64sc(const Ipp16sc*
pSrc1
, const Ipp16sc*
pSrc2
, int
len
, Ipp64sc*
pDp
);
IppStatus ippsDotProd_16s16sc64sc(const Ipp16s*
pSrc1
, const Ipp16sc*
pSrc2
, int
len
, Ipp64sc*
pDp
);
IppStatus ippsDotProd_16s32f(const Ipp16s*
pSrc1
, const Ipp16s*
pSrc2
, int
len
, Ipp32f*
pDp
);
IppStatus ippsDotProd_32s_Sfs(const Ipp32s*
pSrc1
, const Ipp32s*
pSrc2
, int
len
, Ipp32s*
pDp
, int
scaleFactor
);
IppStatus ippsDotProd_16s32s_Sfs(const Ipp16s*
pSrc1
, const Ipp16s*
pSrc2
, int
len
, Ipp32s*
pDp
, int
scaleFactor
);
IppStatus ippsDotProd_16s32s32s_Sfs(const Ipp16s*
pSrc1
, const Ipp32s*
pSrc2
, int
len
, Ipp32s*
pDp
, int
scaleFactor
);
Include Files
ipps.h
Domain Dependencies
Headers:
ippcore.h
,
ippvm.h
Libraries:
ippcore.lib
,
ippvm.lib
Parameters
pSrc1
Pointer to the first vector to compute the dot product value.
pSrc2
Pointer to the second vector to compute the dot product value.
pDp
Pointer to the output result.
len
Number of elements in the vector.
scaleFactor
Scale factor, refer to Integer Scaling .
Description
This function computes the dot product (scalar value) of two vectors,
pSrc1
and
pSrc2
, and stores the result in
pDp
.
The computation is performed as follows:
To compute the dot product of complex data, use the function
ippsConj
to conjugate one of the operands. The vectors
pSrc1
and
pSrc2
must be of equal length.
Return Values
ippStsNoErr
Indicates no error.
ippStsNullPtrErr
Indicates an error when the
pDp
,
pSrc1
, or
pSrc
2 pointer is
NULL
.
ippStsSizeErr
Indicates an error when
len
is less than or equal to 0.

Example

The example below shows how to use the function
ippsDotProd_64f
to verify orthogonality of the sine and cosine functions. Two vectors are orthogonal to each other when the dot product of the two vectors is zero.
void dotprod(void) { Ipp64f x[10], dp; int n; for (n = 0; n<10; ++n) x[n] = sin(IPP_2PI * n / 8); ippsDotProd_64f(x, x+2, 8, &dp); printf_64f(“dp =”, &dp, 1, ippStsNoErr); }
Output:
dp = 0.000000 Matlab* Analog: >> n = 0:9; x = sin(2*pi*n/8); a = x(1:8); b = x(3:10); a*b'

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804